Lock.



A. STEVENS.

LOOK. APPLICATION nun 11017.28, 1908.

w/ r/viss 5 Patented June 27, 1911.

sens '1 FFTCE.

LOCK.

Specification of Letters Patent.

Application filed November 28, 1908.

Patented June 27, 1911.

Serial No. 464,857.

T 0 all whom it may concern: 7

Be it known that I, ARTHUR CHARLES STEVENS, subject of the King of Great Britain, residing at Lulworth, Queens Road, Hounslow, in the county of Middles-ex, England, have invented new and useful Improvements in Locks, of which the followingis a specification.

This invention has reference to improvements in that class of locks, known as tubular looks, or tubular mortise locks, and the object of the present invention is to make such looks more secure by enabling a greater variety in the locking mechanism to be used and also to prevent the handle being turned or operated when the bolt is locked in its forward position.

The invention is illustrated on the accom panying drawings in which Figure 1 is a plan view of the one portion or part of my tubular lock, the other portion, which fits onto this part, shown by Fig. 2, being removed. Fig. 3 is a side view of the sliding bolt and the bar which operates same. Fig. 1 is an end view of the rollback which operates the bar and sliding bolt. Fig. 5 is a part sectional view of the part of the lock which fits onto the part shown by Fig. 1, showing another form of locking mechanism.

The tubular case of the lock, which is formed in two parts 1 and 2, and into the part 1 of which the sliding bolt 3 and operating bar 4 fit, is made with two semicircular bearings in the part 1. and a semicircular groove 5 in the part 2 for the rollback 6 to rest in. This rollback 6, through which the knob spindle passes, is provided with a projection 7 somewhat like a. quadrant, as shown by Fig. 1, which takes into the slot 8 formed in the bar 4. A slot 9 is also providedin the part 1 of the case to en able the quadrant 7 to make a quarter revolu-' tion, or thereabouts, when the rollback is turned or operated. The one end of the quadrant 7 butts against the edge of the transverse groove 5 so that the knob spindle can only be turned in the one direction.

In order to multiply the variety of keys for operating the reciprocating locking bar 10, which engages with the part 22 of the bolt 3 and which fits in slots in the transverse guides 11 in the part 2 of the case, I provide the plates 12 and 13. These plates 5 fit transversely in the part 1 of the case,

on either side of the key hole, recesses being formed in the edges of this part of the case to receive the ends of the plates to allow the said plates to lie flush with the said edges. The plates are formed with a variety of wards, as shown by Fig. 1, so that a lock fitted with plates having certain wards, can only be opened with that key made to suit such wards. It will thus be seen, by fitting the locks with plates having different wards, that a great variety of keys can be obtained. It will also be seen, when the locking bar is moved forward in engagement with the part 22, that the knob spindle is held rigid on account of the quadrant 7 butting against the forward edge of the transverse groove 5.

At Fig. 5 I have shown another form of locking mechanism. In this arrangement I dispense with the locking bar 10, the bars 12 and 13 and the transverse guides 11 in the part 2 of the case, and in place of the said guides I provide a division piece or plate 14 opposite the key holes, down the center of and parallel with the sides of the case. Fitting onto studs 15 fixed in this division plate, either on one or both sides of the said plate, is a bar 16 capable of sliding backward and forward on the said studs when operated by the movement or turning of the key. Also fitting onto the studs 15, in transverse slots 17, is a plate 18, capable of being lifted by the key when turned, a spring 19 being provided for holding the said plate in the normal position. The lifting plate is also provided with notches or slots 20 at the lower edges, which take onto studs or projections 21 on the face of the sliding bar 16, so that when the said plate is in the normal position, the sliding bar 16 cannot be moved. To secure the sliding bolt 3 in its forward position, the sliding bar 16 is moved forward by the key until the end abuts against the end 22 of the said bolt. Before however the said sliding bar 16 can be operated by the key, the plate 18 must be lifted upward by the turning of the key, to clear the studs 21. It will thus be seen that by varying the plate 18, the lock can only be opened by the particular key made to operate or lift the said plate. It will also be evident that there may be only one plate 18 or any convenient number of these plates, and that if desired these plates may be mounted on the sliding bar 16, either on one or both sides of the division plate 14. The key mayoperate the locking mechanism on either side of the division plate 14 simultaneously from the one side or separately. I may if desired form the bolt 3 with a double nose so that the lock may be used with swinging doors. A spring is provided having one end bearing against the end of the case and its other end against the upturned end of the part 4 of the sliding bolt to hold said bolt normally pressed outwardly.

What I claim as my invention, and desire to secure by Letters Patent is l. A tubular lock comprising a two part casing and having a key hole therein, a sliding bolt, a reciprocating lockingbolt adapted to be actuated by the key to engage with the sliding bolt to hold it against movement, and plates extending transversely of said casing, said plates being spaced opposite to one another on each side of the key hole, and having wards on their adjacent edges,

said plates being held between the meeting edges of the parts of the casing.

2. A tubular lock comprising a two part casing and having a key hole therein, a sliding bolt, a reciprocatinglockingbolt adapted to be actuated by the key to engage with the sliding bolt to hold it against movement, one of the parts of said casing being provided with a recess in its edges and positioned on both sides of the key hole, plates extending transversely of said casing and having their ends engaging within said recess, said plates being positioned opposite to one another on each side of the key hole and having Wards on their adjacent edges.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR CHARLES STEVENS. lVitnesses:

H. D. JAMEsoN,

F. L. RAND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Vfashington, I). G. 

